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Any food that has carbohydrate, protein, and fats can be shown positive for those food test. It is basically a chemical reaction that indicate the presence of food component by a specific color formation.
the color of a positive test results is bright green
A red color is the positive result>
A positive test, when using Biuret reagent, would be purple-ish
Yes, it is possible (color test).
intense blue or black
A pink color must be obtained.
yes a line is a line,I'd say it's positive
When testing silver nitrate, a whitish color will yield positive results. If the test is negative, the color will turn clear and it will remain transparent.
4
bluish color if pentose is present.
yes it will ferment the mannitol and cause yellow color change.